1. laser engraver air assist 2. laser machine attachment 3. air pump 4. for blower during engraving laser air assistair pump This air pump is for small machine series, such as TR-5030, TR-5030H, TR-6040 and TR-6040H. For big machine, such as TR-9060 and TR-1390, we matched with blower: You can choose according to your situation!